Hello, I have a serious problem, my first time I had sexual performance anxiety, I am a boy and I have big sexual complexes and I was not able to do it.
First of all, good for you that you reached the point to have you first intercourse, a milestone!
Regarding meditations, you got a reply already, to which I would add "emotional body cleaning" by HPs Lydia you find on the forum here.
Something that happened to me, in various situations, is being connected to a mass mind energy about something. I mean, the "first time" is a big concern for all people, movies, magazines, posts... every man on the earth may have expressed (even internally,by just thinking) his concerns and worries about the first intercourse. This created huge amounts of energy and may embed into the mass mind, that is a sort of giant vortex influencing a group of people (race, nation, city, workgroup... etc.) I think you may feel anxiety both for your own worry, but also for external energies influencing you. Just try to live this experience as your own only, and disconnect from the mass mind, that listen to movies, porn, and general crap around. This may help to be more focused, it is YOU doing that, not like OTHERS would do that if they were you.
I hope this helps.
In case you want to relate a bit more about what kind of hangups you may have, just feel free to express on here, I will listen. Sometimes, just talking openly about this with someone, helps to partially solve them.